npm-edit(1) -- Edit an installed package
npm edit <name>[@<version>]
Opens the package folder in the default editor (or whatever you've
configured as the npm
editor config -- see
npm help config.)
After it has been edited, the package is rebuilt so as to pick up any changes in compiled packages.
For instance, you can do
npm install connect to install connect
into your package, and then
npm edit connect to make a few
changes to your locally installed copy.